* {
    margin: 0 ;
    padding: 0;
}
html , body {
    width: 100%;
    height: 100%;
    background-color: #efefef;
}
ul {
    list-style: none;
}
h1 {
    line-height: 200px;
    font-size: 32px;
    text-align: center;
}
h3 {
    line-height: 100px;
    font-size: 28px;
    text-align: center;
}
img {
    display: table;
    width: 500px;
    margin: 50px auto;
}